<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header></Header>
      <List :list="todos"></List>
      <Footer></Footer>
    </div>
  </div>
</template>

<script>
import Header from './components/Header.vue'
import List from './components/List.vue'
import Footer from './components/Footer.vue'
import PubSub from 'pubsub-js'
export default {
  // 定义数据
  data() {
    return {
      todos: [
        {
          id: 1,
          todoName: '吃饭',
          isDone: false,
        },
      ],
    }
  },

  components: {
    Header,
    List,
    Footer,
  },

  // 挂载成功的时候订阅话题,接收数据
  mounted() {
    PubSub.subscribe('add', (topic, todoName) => {
      // 这个函数中一定会操作数据,就需要通过this获取当前组件的实例.所以一定要写箭头函数
      // 根据任务名创建任务对象
      const todo = {
        id: this.todos.length ? this.todos[this.todos.length - 1].id + 1 : 1,
        todoName,
        isDone: false,
      }
      // 将任务对象添加到todos中
      this.todos.push(todo)
    })

    PubSub.subscribe('update', (topic, id) => {
      this.todos.forEach((item) => {
        if (item.id === id) item.isDone = !item.isDone
      })
    })
  },

  // 组件卸载的时候要清除订阅
  beforeDestroy() {
    // 清除所有订阅
    PubSub.clearAllSubscriptions()
  },
}
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
